condition mean min max ZT0-3 22.796799999999998 22.796799999999998 22.796799999999998 ZT4-7 21.9889 21.9889 21.9889 ZT8-11 28.3369 28.3369 28.3369 ZT12-15 24.283499999999997 24.283499999999997 24.283499999999997 ZT16-19 21.6436 21.6436 21.6436 ZT20-23 24.7222 24.7222 24.7222